If we want to know how many people are at risk from malaria and in which areas, we need to know both where the malaria risk is and where people live.

The risk from malaria can change from high to low, or *vice versa*, within a relatively short distance so we need to be able to map where people live within these same short distances. National census data is published on a large scale that does not provide us with the detail we need. We therefore use mathematical formulae to calculate the continuous distribution of the population within an area. These formulae take account of the locations of land features that are known to affect the distribution of the population, such as towns and cities, land use classes or roads.

### Find our estimates of populations at malaria risk using the Resource Browser